... Impedance: 2mΩC. Frequency: 45-65HZD.Electric Energy: Bi-directional active/Reactive electric energy metering4. Power supplyA. Working scope ... Electric energy pulse: Passive optocoupler collector output2.) two way RS485 communication interface, Modbus-RTU communication protocol3.) Communication Baud ... , parity mode N81,E81,O814.) The second way RS485 communication interface can be chose as PROFIBUS-DP ...